posted
Term-Lab is the best Car Audio SPL metering system ever developed. PERIOD.
Thanks.
-------------------- Bobby Riley Art's Sound Chamber
Fifteen time SPL World Champions-----26 SPL World Records DB Drag == IASCA == USACi == MECA Posts: 3500 | From: Retirement Village in Branson Missouri. | Registered: May 1999
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posted
Bah what do you know its not like you've ever held any world records or anything. the only thing I dont like now is that the uneducated people who are like I did a 150 at this competition fail to realize the difference between the mics. don't realize that that 150 on an Ac is like a 140 on the TL.
-------------------- BEWARE OF SHADY SELLERS!!!!! Tom Orozco KB Audio Your name can be here too! Posts: 5559 | From: Newburgh, NY | Registered: Oct 2001
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posted
Although I like the consistancy of the mic,
I don't like the fact it does not show actual SPL scores. It does something like averages your top three frequencys, in doing so gives you a ~-6dB number from actual SPL. The new TL has been reffered to as "the new mics". So the score it gives, which is DRASTICALLY different than the actual score (aprox 1/4 the actual level) could be called "NTLSPL" or New-Term-Lab-SPL, not to be mistaken for SPL.
I would prefer it just give you your actual SPL score, one at least close to the defined decibel sound scale. Such as acoustic signal power equal to 10 times the common logarithm of the ratio in respect to the average least perceptible sound.
This is done is software, so I guess I mostly have a problem with the math that is used rather than 1=1.
I know some of you wont believe me, but i take a look at your output graph and the score in the extended info screen, and you'll see your real SPL (~+6dB).
Lastly, I don't mean to offend anyone. I just want to say my "opinion". Maybe someone will give me more insight as to what I have gathered from using the NTL mic.
quote:Originally posted by DD Cherokee: Although I like the consistancy of the mic,
I don't like the fact it does not show actual SPL scores. It does something like averages your top three frequencys, in doing so gives you a ~-6dB number from actual SPL. The new TL has been reffered to as "the new mics". So the score it gives, which is DRASTICALLY different than the actual score (aprox 1/4 the actual level) could be called "NTLSPL" or New-Term-Lab-SPL, not to be mistaken for SPL.
I would prefer it just give you your actual SPL score, one at least close to the defined decibel sound scale. Such as acoustic signal power equal to 10 times the common logarithm of the ratio in respect to the average least perceptible sound.
This is done is software, so I guess I mostly have a problem with the math that is used rather than 1=1.
I know some of you wont believe me, but i take a look at your output graph and the score in the extended info screen, and you'll see your real SPL (~+6dB).
Lastly, I don't mean to offend anyone. I just want to say my "opinion". Maybe someone will give me more insight as to what I have gathered from using the NTL mic.
The averaging is done so that Term-Lab tracks accurately as compared to the $15,000 + meters that are sold to the Government etc and the Termlab is a fraction of the cost.
-------------------- Bobby Riley Art's Sound Chamber
Fifteen time SPL World Champions-----26 SPL World Records DB Drag == IASCA == USACi == MECA Posts: 3500 | From: Retirement Village in Branson Missouri. | Registered: May 1999
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posted
Term-LAB is designed to emulate a B&K 2231. (We own 2). Term-LAB tracks the B&K perfectly until the B&K starts running out of headroom at higher SPL's.
You are probably confused because the analyzer you are using has 1/3 octave bands (like the AudioControl). Term-LAB has 1 Hz frequency resolution. If we were to display the RTA in 1/3 octave mode, then the SPL's displayed in the RTA would be very close to the numbers displayed.
The extended info screen shows the max spl at a single frequency. But SPL meters use read bandwidths that are greater than 1 Hz wide. The meter takes the RMS value of more than 1 bar.
B&K has been the definative reference for SPL meters for many years. Our meters cost more than $10,000 each. They undergo calibration every year (for a cost of $800). They are accurate and Term-LAB tracks their measurements precisely.
-------------------- "Keep it Loud and Make me Proud!"
posted
Well that is cool that we can buy a sensor that measures like a 10G meter for less than 1G.
Why do we now use a sensor that reads a bandwidth that is greater than 1 Hz wide? The dB drag CD only has single frequency tracks, corect? Then would it not follow to measure the same bandwith as the bandwith on each track?
Is the idea to transion dB Drag into music measurement, or, what am I missing?
posted
well i like mine. but, wondering why mine reads about 1 db different than the one's they use at the USAC shows ?
-------------------- bryan b. Team DB Driven Team Gates Bryan@SickAudio DD's are fun... Posts: 506 | From: PRYOR,OK. | Registered: Sep 2003
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quote:Originally posted by nomad40: well i like mine. but, wondering why mine reads about 1 db different than the one's they use at the USAC shows ?
anyone have any ideals as to why this occurs ?? thx for any help. bryan b.
-------------------- bryan b. Team DB Driven Team Gates Bryan@SickAudio DD's are fun... Posts: 506 | From: PRYOR,OK. | Registered: Sep 2003
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posted
Assuming your meter reads 1 dB differently when compared to multiple other meters, and assuming your system is very consistent, the there are only a few things that could be causing the difference.
1. The K-factor is not set correctly. 2. We made an error when we wrote your K-factor in your owner's manual. 3. The sensor cable is damaged in some way. 4. The senosr is bad. 5. The interface box calibration has been corrupted.
I would try the following.
1. Get a new cable. (You may need a new one by now anyway.) 2. Place your sensor inside of your vehicle at the same time as another system's sensor and measure the difference. 3. Reverse the placement of the sensors and repeat the process. (This checks consistency due to placement.)
If your sensor reads consistently different (the same difference at different SPL's, you can correct the problem by adjusting your K-Factor so that your meter reads the same as the reference meter.) Of course, you had better be sure that the reference meter is accurate.
-------------------- "Keep it Loud and Make me Proud!"
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